Username is the name with which you're identified on the distant server. For FTP publication, this username corresponds to the Tripod sitename, you chose during the Tripod registration process. It is also the name with which people reach your site on the Web, such as
http://members.lycos.co.uk/sitename/
вот что написанно у них в хелпе
Connected to ftp.members.lycos.co.uk Port 21
220 ftp-uk.tmm.lyceu.net FTP server ready
USER ******
331 Password required for ******.
PASS (hidden)
530 Access denied.
Connection failed
а вот чего пишет FlashFXP